Multiple Choice
Craters on Mars have flatter bottoms and their rims appear to be more worn down than those on either Earth's Moon or Mercury. What has caused this wear?
A) breakdown of the rocks by the extreme temperature variations between day and night
B) erosion by the seasonal fall and subsequent melting of carbon dioxide snow
C) erosion by wind and infilling by dust storms
D) erosion by rainfall, now and in the past
Correct Answer:
Verified
Correct Answer:
Verified
Q5: The density of Mercury is about the
Q6: Evidence of past water on Mars comes
Q7: The surface features and overall topology of
Q8: At greatest elongation, the Earth-Venus line makes
Q9: Mercury's atmosphere is<br>A) almost nonexistent.<br>B) relatively dense,
Q11: What role has methane played in the
Q12: Spacecraft measurements indicate that the surface of
Q13: What is the observed feature that suggests
Q14: The origin of the Martian magnetic field
Q15: The albedo, or fraction of light reflected